Takhakh, Ayad M., and Asmaa M. Abdullah. “The Optimization Conditions of Friction Stir Welding (FSW) for Different Rotational and Weld Speeds”. Nahrain University College of Engineering Journal, vol. 15, no. 2, Sept. 2012, pp. 187-96, https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/623.